Fluid-pressure-operated tool.



Patented Aug. 5, 1913.

SHEETS-SHEET l.

W. PRELLWITZ.

v FLUID PRESSURE OPERATED TOOL.

APFLIUATION FILED APR. B, 1909. 1,069,289.

. tions PATENT onirica.

WILLIAM PRELLWITZ, 0F EASTON, PENNSYLVANIA, ASSIGNOR T0 .lNGERSOLL-RANDCOMPANY, or New YORK, N. Y.,

A CORPORATION 0F NEW JERSEY.

FLUID-PRESSURE-OPERATED TOOL.

' Specification of Letters Patent.

Patented Aug. 5,1913.

Application led April 8., 1909. Serial No. `488,720.

To all whom t may concern Be it yknown that I, VILLIAMI'PRELLWITZ, acitizen of the United States, and resident of Easton, in the county ofNorthampton und State of Pennsylvania, have invented a new and usefulImprovement in Fluid-Pressure-OperatedTools, of which the following is aspecification.

My invention relates to fluid pressure operated tools, such as hammerdrills, having a Huid pressure operated feeding device, and' has for itsob'ect to provide certain improvements in t e construction, form andarrangement of the several parts thereof, whereby means are provided forregulating or governing the amount of fluid pressure in the feedingdevice'so that the degree of power exerted by the tool feeding device'may' be adjusted for different inclinations of the tool; and in whichthe tool feeding d'evice is located along the side of the tool therebymaking the tool much shorter and' more compact than heretofore.

A practical embodiment of this invention is shown in connection with apneumatic hammer drill having a water feed attachment and an automaticrotation for the drill steel, and a pneumatic feed for the drill.

, Figure l represents in top'plan so muchv of a. pneumatic hammer drillas will give a clear understanding of my invention,` F 2 is alongitudinal central section throug the same in the plane of the lineA-A of Fig. 1, Fig. 2a isa det-ail` section through.

the automatic rotation device.' Fi 3 is a detailsection taken in theplane o the, linev B-B 'of Fig. 2, Fig. if-isa transverse sec# tiontaken in the planef oflfthefline C-C of Fig. 2, Fig. is an outerend viewof the drill, the drill steel being shown in sectioxi,,v

Fig. 6 is a detail longitudinal section taken in the plane of the lineDl of Fig.- 4, Figs.,

7, 8 and 9 are enlarged-detail-eross sections taken in the plane .of theline .Enf Fig. 3, showing 'one of the manually operated com trollingvalves in three of its operative posiand Figs. 10, 11 and 12 areenlarged detail lcross sections through said manually 'operatedcontrolling valve taken in the plane of the line F of Fig. 3, showingthe\valve in its three positions corresponding to Figs. 7, 8 and 9.

The hammer drill cylinder is denotedv by l and its reciprocating pistonby 2. The

.5.5 chuck for the hollow drill steel 3 comprises an inner member 4 andan outer member 5 both mounted within the cylinder 1. An anvil block6 islocated ,Within the chuck of the piston 2, as follows :-A .l nut 8 isscrewed into the inner endv of the inner member 4 of the chuck, whichnut has a. spirally iiuted bore .for engaging the spirally iuted hammerextension 7 of the piston 2. This extension 7 slides freely through aring 9, which forms the front head of the piston chamber 410. The rearend of the piston 2 is provided with an axial bore 11 into which isscrewed a nut 12 having a straight fiuted bore arranged to engagea.straight'fluted bar 13`which projects f orwardly from the inner member1410i a rotating mechanism, the outer -member )of .which is denoted by15 and between which members is the usual pawl and ratchet connection.

A device for feeding fluid under pressure, as, fol-*instance water,tothe hollow drill inder l, which device 'is separate from the devicefor supplying the motiveluid to the tool and may be constructed asfollows z-A Awater supply pipe 16 is in open communication through thesidewall of the cylinder 1 with an annularwater supply chamber 17surrounding the outer member 5 of the chuck," which chamberis formed byprovid- `-in`g a rin member v5.of the chuck. Washers l19 and 20 formwater tight packings for the chamber l`between` the ringl8 -and thechuckmember A lduct`21 leads from the annular chamber 17 to the space 22around the' inner end of the hollow drill steel 3. Thabore 23 of the vhollow drill steel is at -all times in open the armsi, 2

fitfinstance by Irovidi'n oft the shell7 n,Witl'n angle communicationwith the space 22 and to be inovedalongfits supporting shell 25 it, ..1

Y( Y oars 28,29, fitted 110 at threar end of the drill steel 3inposition An. automatic step by step rotation impartedlto the drillsteel by the reciprocation steel is provided at the front end of thecyl- 18v located within the outer `end of the cylinder 1' and spacedfrom the outer' lo portions of the cylinder l in which reentrant anglesare formed. rThis shell 25 may have a cone 30 for pivoting the tool toany suitable support.

The device for feeding the tool forward to its work is constructed andarranged as follows: The feed cylinder 31 is located at the side of andin juxtaposition to the tool cylinder l and the hollow rod 32 of thefeed piston has' its forward end secured to an oli'- set portion 33 atthe outer end of the cylinder Al. The rear head of the cylinder 31 isdenoted by 34 and the front head thereof, which forms. a dust and dirtexcluding cap, by A cross pin 36 passes through the supporting shell 25and the front head 35 of the cylinder 31 for holding the cylinderagainst longitudinal movement with respect to the supporting shell.

One means for regulating or governing the amount of iiuid pressure inthe feed cylinder according to the position or inclination of the holebeing drilled, may be constructed, arranged and opcrated'as follows Thehead .37 of the feed piston is provided with a hole 38 formed lengthwisetherethrough so as to provide a fixed leak of a predetermined amountfrom the power side of the piston head to the other side thereof. Thespace in front ofthe piston head 37 is open to external atmosphere as,for instance, throughia hole 39 in the cylinder front head or cap 35 sothat the fluid which leaks through the hole 38 in, the piston headescapes from the space in front of the head to external atmosphere. Amanually operated valve is arranged in the offset portion 33 at theouter end of the cylinder l in position to control the amount of fluidpressure fed to the rear or power side of the piston head 37 through thehollow piston rod `32.l This valve is herein shown as of the rotary plugtype, the body of the valve being denoted by 40, its stem by 41 andv itshandle by 42. The valve body 40 is provided with an axial port 43, opento the interior of the hollow piston rod 32 and with a pluralityoftransverse ports, in the present instance four ports 44, 45, 46, 47,of gradually increasing area, any .desired one of which is arranged tobe brought into y open communication with ,the passage 48 through whichthe pressure fluid is fed to the tool feeding device. This manually.

operated valve is yieldingly held in its different rotary positions as,for instance, 'by providing the periphery of the handle 42 with a seriesof recesses 49, 50, 51, 52, corresponding to the transverse ports 44,45, 46, 47, any one of which recesses is arranged to be engaged by aspring pressed ball 53. A spring 54 surrounding the valve stem 41 servesto hold the body 40 of the valve in its seat.

The cylinder valve chest is denoted by 55,

arranged to open and close the admission of theA pressure fluid to thetool through the inlet port 57 and to open and close communicationto thetool feeding device controlling valve as follows z-The tapered body ofthe valve is denoted by 6l and it is held in its seat by a coil spring62. The smaller end of this valve is provided with al handle 63. Thebody 61 of this valve is provided with an axial port 64 in openconimunication with the fluid supply pipe 65. This axial port 64 isprovided in one transverse plane with a transverse port 66 for openingand closing communication to the inlet port 57 and it is provided inanotler transverse plane with a transverse p ort 67 l ated fluid supplycontrolling valve is 1n the position shown in Figs. 7 and 10, the

pressure fluid is open to the tool feeding device but closed to thetool. When the valve is in the position shown in Figs. 8 and 1l,

the" Huid supply isstill open to the tool feeding device and is alsoopen to the tool for permitting the .operation .of the same.

When the valve is in the position shown inA Figs. 9 and 12, the fluidsupply'is cut olii' from both the tool feeding device and the tool; thetool feeding device at the same time being open to external atmosphere.

The reason for the fixed leak through the tool feeding piston and forthe varying sizes of ports in the tool feeding device, is as followsz-When the tool is being used with its steel pointed downwardly in asubstantially vertical position, only sufhcient pressure is needed inthe feed cylinder for working 'the' tool in that position. Therefore,when the parts are in this position, the

smallest port in" the tool 'feeding device con- Y seen that a suicientamount of the pressure fluid must be fed to the feeding device toovercome the weight of the tool cylinder and its parts. This may beaccomplished by turning the tool feeding device controlling valve into aposition to open its largest port to the back or" the tool feedingpiston. The right amount of l'iuid to he fed for feeding the tool steelto its Work in diierent angular positions between the downward verticaland upv/ard vertical limits, can be taken care of with the intermediatesizes of ports in the tool feeding device controlling valve.

it will be seen that not only is the` tool made much more compact bymounting the feeding device therefor along the side of the tool cylinderbut also novel means are provided for regulating the amount of thepressure in the tool feeding cylinder according to the angular positionof the tool with respeet to its support.

While I have shown one means for regulating or'governin' the pressure inthe feeding cylinder accor ing to the conditions required, it is evidentthat other means might be employed for accomplishing the same result;hence l do notl Wish to limit myself to the Ineens herein shown anddescribed, lout 1. A uid pressure operated tool, a duid pressureoperated tool feeding device having a iiXed leal; and means forcontrolling the amount 'of pressure fluid `edV to the feeding device.

.2. la fuid' pressure operated tool, a duid pressnre'operated toolfeeding device having a fixed leak, means adaptedto admit pressure duidto the tool and there maintain. the supply and means for varying theamount of pressure fluid-fed to the feeding device.

l 3. A inid pressure operated. tool, a duid pressure operated toolfeeding device, a manually operated valve for controlling the supply ofpressure fluid to the feeding device, a second manually operated valvefor controlling the supply of pressure fluid coth to Athe tool and tothe first-named valve, said feeding device having a xed leak.

A fluid pressure operated tool, a Suid' pressure opel eed :feedingdevice ther-eier having a lixed leal: and a manually operated valvehaving ports of dierent sizes ttor controlling the ernennt of pressureiinid ed to the feeding device.

ln testimony, that i claim the foregoing as my invention, l', havesigned my name in presence of two Witnesses, this seventh of Aaprili969.,

NLJM FRELLWTZ.

VWitnesses z F. Geenen BARRY, HENRY Copies o this patent may be obtsueffer: five cents each, "oy aressing the C emssener of Patents,

Washington, v3.

